本文实例讲述了php封装的mysqli类。分享给大家供大家参考,具体如下:
类:
<?php header('content-type:text/html;charset=utf-8'); /* 掌握满足单例模式的必要条件 (1)私有的构造方法-为了防止在类外使用new关键字实例化对象 (2)私有的成员属性-为了防止在类外引入这个存放对象的属性 (3)私有的克隆方法-为了防止在类外通过clone成生另一个对象 (4)公有的静态方法-为了让用户进行实例化对象的操作 */ class ConnectMysqli{ //私有的属性 private static $dbcon=false; private $host; private $port; private $user; private $pass; private $db; private $charset; private $link; //私有的构造方法 private function __construct($config=array()){ $this->host = $config['host'] ? $config['host'] : 'localhost'; $this->port = $config['port'] ? $config['port'] : '3306'; $this->user = $config['user'] ? $config['user'] : 'root'; $this->pass = $config['pass'] ? $config['pass'] : 'root'; $this->db = $config['db'] ? $config['db'] : 'small2'; $this->charset=isset($arr['charset']) ? $arr['charset'] : 'utf8'; //连接数据库 $this->db_connect(); //选择数据库 $this->db_usedb(); //设置字符集 $this->db_charset(); } //连接数据库 private function db_connect(){ $this->link=mysqli_connect($this->host.':'.$this->port,$this->user,$this->pass); if(!$this->link){ echo "数据库连接失败<br>"; echo "错误编码".mysqli_errno($this->link)."<br>"; echo "错误信息".mysqli_error($this->link)."<br>"; exit; } } //设置字符集 private function db_charset(){ mysqli_query($this->link,"set names {$this->charset}"); } //选择数据库 private function db_usedb(){ mysqli_query($this->link,"use {$this->db}"); } //私有的克隆 private function __clone(){ die('clone is not allowed'); } //公用的静态方法 public static function getIntance(){ if(self::$dbcon==false){ self::$dbcon=new self; } return self::$dbcon; } //执行sql语句的方法 public function query($sql){ $res=mysqli_query($this->link,$sql); if(!$res){ echo "sql语句执行失败<br>"; echo "错误编码是".mysqli_errno($this->link)."<br>"; echo "错误信息是".mysqli_error($this->link)."<br>"; } return $res; } //打印数据 public function p($arr){ echo "<pre class="brush:php;toolbar:false">"; print_r($arr); echo "
"; var_dump($arr); echo "
用法测试:
//mysqli测试 $db=ConnectMysqli::getIntance(); //var_dump($db); /*$sql="select * from acticle"; $list=$db->getAll($sql); $db->p($list);*/ /*$sql="select * from acticle where acticle_id=95"; $list=$db->getRow($sql); $db->p($list); */ /*$sql="select title from acticle"; $list=$db->getOne($sql); $db->p($list);不行*/ //$list=$db->insert("users",$_POST); //$del=$db->deleteOne("users","id=29"); //$del=$db->deleteAll("users","id in(27,28)"); //$up=$db->update("users",$_POST,"id=27"); //print_R($list);
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